﻿using System;

namespace ConsoleApp3
{
   
        public abstract class Student
        {
            public int id;
            private readonly string name = "鱼";
            internal static int age = 19;
            protected string major = "鱼总";
        }
        public sealed class Student2
        {
            public readonly string name = "猪";
            internal static int age = 19;
        }
        public sealed class Student3
        {
        public int id;
            private static readonly string name = "象";
            internal static int age = 20;
        }
        internal abstract class Teacher
        {
            public int id;
            private readonly string name = "狗";
            internal static int age = 26;
            protected string major = "山沟沟";
        }
        internal sealed class Teacher2
        {
            public int id;
            private readonly string name = "啊啊";
        internal static int age = 28;
        }
        
    
}
